By default, the plot is sorted in ascending order based on the category
values.
Restrictions
This option takes effect only when the plot statement specifies a
response variable and the axis for that variable is numeric. If the axis
is not numeric, an error is generated and a message is written to the
SAS log.
Uniform scaling and response sorting cannot occur on the same axis.
If the UNIFORM= option is used in the SGPLOT statement, the
UNIFORM option is ignored for the sorted response axis and a note is
generated in the log. The UNIFORM= option is applied to the other
axes and groups ...
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